Portable Ohaus YA Series Scales are great for weighing precious metals, gems, or diamonds on the road or in the office. With a bright, backlit display these scales are easy to read, and come with 1 year warranty. Weighing modes include ct, g, gn, oz. Runs on 2 AAA batteries. Scale measures 4 1/4" x 3" x 4/5". This model YA302 has a maximum weighing capacity of 300g x .05g.